IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
12-10
March 2020
Page 67
IO-390-D Series Engine Maintenance Manual
(3)
Measure the oil level per the “Oil Level Check” procedure in this chapter. Add more oil if
necessary until the oil level in the engine is sufficient.
(4)
Install the oil level gage assembly (dipstick) into the oil level gage tube securely.
(5)
Record the amount of oil added to calculate oil consumption in the engine logbook.
6.
Oil Leak Check
A.
Examine the following for oil leaks:
•
Oil sump drain plugs
•
Suction screen plug
•
Oil filter
•
Oil hoses connected to the oil cooler
B.
If leaks are found, identify and correct the cause. Complete the Operational Leak Check
Sheet in Chapter 05-20.
C.
After the cause of the oil leak is corrected, measure the oil level. Refer to “Oil Level Check”
in this chapter. Add oil as necessary per the procedure “Add Oil to the Engine” in this
chapter.
7.
Oil Servicing Schedule
A.
The recommended schedule for oil changes, suction screen cleaning, and oil filter
replacement are shown in Table 1.
Table 1
Oil Servicing Schedule
Task
Frequency
Initial oil change and oil filter replacement or
oil pressure screen cleaning of any new, rebuilt
or overhauled engine, or engine returned to
service after storage
After the first 25 hours of operation after
initial start-up or every 4 months (whichever
occurs first*)
Repeat as necessary until oil consumption
stabilizes.
Routine oil change and oil filter replacement
(after initial 25-hour oil change and oil filter
replacement) on engines with an oil filter
&
Oil suction screen cleaning/inspection
After every 50 hours of engine operation or
every 4 months (whichever occurs first*)
After replacement of any engine cylinder
Routine oil change and oil pressure screen
cleaning/inspection
After every 25 hours of operation or every 4
months (whichever occurs first*)
After replacement of any engine cylinder
* Oil change intervals must not exceed 4 months regardless of operating hours and especially if
the aircraft has not been flown for at least 25 hours in a 4-month period. More frequent oil
changes are recommended if the engine has been exposed to volcanic ash, particulate, sand,
dust, debris, or extreme weather conditions.
